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Yes, a slight piston dome, I use around 6cc, eliminates the need to cut th=
e head so much, & doesn't interfere w/flame travel/combustion.When you get =
down to around 3.150 thick, things get iffy...
Also when establishing CR, book recommendations are just that, general star=
ting points; valve head type & seat depth affect chamber volume, so it's be=
st to cut the head after all else has been established.
Glen Efinger
On Sunday, April 7, 2024 at 02:36:01 AM EDT, tr4 via Fot <fot@autox.tea=
m.net> wrote: =20
=20
I have never had to go that far.=C2=A0 The problem would be not the combus=
tion chamber but the flat surface would be way too thin and collapse in sho=
rt order.=C2=A0 You would be much better off with popping the piston or go =
with a slight done to get that level of compression.
Sent via the Samsung Galaxy S23+ 5G, an AT&T 5G smartphone
-------- Original message --------From: GREGORY THOMPSON via Fot <fot@autox=
.team.net> Date: 4/5/24 6:36 PM (GMT-06:00) To: FOT Triumph <fot@autox.team=
.net> Subject: [Fot] TR4 head milling=20
Has anyone had an issue with breaking into a water jacket on the TR4A head =
with taking off .150?
Thank you,
Greg Thompson=C2=A0_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
m
=20
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<html><head></head><body><div class=3D"ydp6741c26cyahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Yes, a slight piston dome, I=
use around 6cc, eliminates the need to cut the head so much, & doesn't=
interfere w/flame travel/combustion.</div><div dir=3D"ltr" data-setdir=3D"=
false">When you get down to around 3.150 thick, things get iffy...<br></div=
><div dir=3D"ltr" data-setdir=3D"false">Also when establishing CR, book rec=
ommendations are just that, general starting points; valve head type & =
seat depth affect chamber volume, so it's best to cut the head after all el=
se has been established.</div><div dir=3D"ltr" data-setdir=3D"false"><br></=
div><div dir=3D"ltr" data-setdir=3D"false">Glen Efinger<br></div><div><br><=
/div>
=20
</div><div id=3D"ydpac5ed56fyahoo_quoted_3363452919" class=3D"ydpac=
5ed56fyahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Sunday, April 7, 2024 at 02:36:01 AM EDT, tr4 vi=
a Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
=20
=20
<div><div id=3D"ydpac5ed56fyiv9068450430"><div><div>I have =
never had to go that far. The problem would be not the combustion cha=
mber but the flat surface would be way too thin and collapse in short order=
. You would be much better off with popping the piston or go with a s=
light done to get that level of compression.</div><div><br clear=3D"none"><=
/div><div><br clear=3D"none"></div><div><br clear=3D"none"></div><div id=3D=
"ydpac5ed56fyiv9068450430composer_signature"><div style=3D"font-size:12px;c=
olor:#575757;">Sent via the Samsung Galaxy S23+ 5G, an AT&T 5G smartpho=
ne</div></div><div><br clear=3D"none"></div><div><br clear=3D"none"></div><=
div style=3D"font-size:100%;color:#000000;" align=3D"left"><div id=3D"ydpac=
5ed56fyiv9068450430yqtfd17335" class=3D"ydpac5ed56fyiv9068450430yqt39316644=
33"><div>-------- Original message --------</div><div>From: GREGORY THOMPSO=
N via Fot <fot@autox.team.net> </div><div>Date: 4/5/24 6:36 PM (GMT=
-06:00) </div><div>To: FOT Triumph <fot@autox.team.net> </div><div>Su=
bject: [Fot] TR4 head milling </div><div><br clear=3D"none"></div></div></d=
iv><div id=3D"ydpac5ed56fyiv9068450430yqtfd96139" class=3D"ydpac5ed56fyiv90=
68450430yqt3931664433">Has anyone had an issue with breaking into a water j=
acket on the TR4A head with taking off .150?<div><br clear=3D"none"></div><=
div><div style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;=
font-size:16px;" class=3D"ydpac5ed56fyiv9068450430ydp72b54109yahoo-style-wr=
ap"><div><div>Thank you,</div><div><br clear=3D"none"></div><div class=3D"y=
dpac5ed56fyiv9068450430ydp72b54109signature">Greg Thompson </div></div=
></div></div></div></div></div><div class=3D"ydpac5ed56fyqt3931664433" id=
=3D"ydpac5ed56fyqtfd78316">_______________________________________________<=
br clear=3D"none"><a shape=3D"rect" href=3D"mailto:fot@autox.team.net"; rel=
=3D"nofollow" target=3D"_blank">fot@autox.team.net</a><br clear=3D"none"><b=
r clear=3D"none"><a shape=3D"rect" href=3D"http://www.fot-racing.com"; rel=
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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